JP5015336B1 - 無機繊維質ペーパー及びその製造方法 - Google Patents
無機繊維質ペーパー及びその製造方法 Download PDFInfo
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Abstract
【解決手段】平均繊維径が3〜7μmである第一の生体溶解性無機繊維と、平均繊維径が2〜3μmであって、第一の生体溶解性無機繊維の平均繊維径より小さい第二の生体溶解性無機繊維と、バインダーとを含む無機繊維質ペーパー。
【選択図】図1
Description
第一の生体溶解性無機繊維として、SiO2含有量が74質量%、CaO含有量が25質量%、MgO含有量が0.3質量%、Al2O3含有量が2質量%の非晶質のSiO2/CaO繊維(以下、「繊維A」という。)を準備した。繊維Aの結晶化温度は895℃であった。繊維Aの平均繊維径は3.4μmであった。
上述のようにして製造された無機繊維質ペーパーのシール性を評価した。すなわち、まず、各無機繊維質ペーパーの任意の箇所から、外径30mm、内径15mmの試験片を3つずつ打ち抜いた。
上述のようにして製造された無機繊維質ペーパーの圧縮加熱後の復元率を評価した。すなわち、まず、各無機繊維質ペーパーの任意の箇所から、幅25mm、長さ50mmの試験片を3つずつ切り出し、各試験片の厚さ(圧縮加熱前の厚さ)をノギスで測定した。
図1には、生体溶解性無機繊維の配合が異なる6種類の無機繊維質ペーパーについてシール性(L/分)及び圧縮加熱後の復元率(%)を評価した結果を示す。なお、図1に示すシール性及び圧縮加熱後の復元率は、いずれも3つの試験片について得られた値の算術平均値である。また、図1においてシール性の数値が小さいほど、シール性が高いことを示す。
第一繊維として、SiO2含有量が76質量%、CaO含有量が4質量%、MgO含有量が18質量%、Al2O3含有量が2質量%の非晶質のSiO2/MgO繊維(以下、「繊維B」という。)を準備した。繊維Bの結晶化温度は857℃であった。繊維Bの平均繊維径は3.6μmであった。第二繊維としては、上述の実施例1でも使用した繊維Cを準備した。
上述の実施例1と同様に、無機繊維質ペーパーのシール性及び圧縮加熱後の復元率を評価した。図2には、生体溶解性無機繊維の配合が異なる6種類の無機繊維質ペーパーについてシール性(L/分)及び圧縮加熱後の復元率(%)を評価した結果を示す。なお、図2に示すシール性及び圧縮加熱後の復元率は、いずれも3つの試験片について得られた値の算術平均値である。
第一繊維として、加熱処理が施された繊維A(以下、「加熱処理繊維A」という。)を準備した。すなわち、上述の実施例1で使用された繊維Aに、結晶化温度未満である800℃にて20分の加熱処理を施すことにより、加熱処理繊維Aを得た。第二繊維としては、上述の実施例1でも使用した繊維Cを準備した。
上述の実施例1と同様に、無機繊維質ペーパーのシール性及び圧縮加熱後の復元率を評価した。図3には、生体溶解性無機繊維の配合が異なる6種類の無機繊維質ペーパーについてシール性(L/分)及び圧縮加熱後の復元率(%)を評価した結果を示す。なお、図3に示すシール性及び圧縮加熱後の復元率は、いずれも3つの試験片について得られた値の算術平均値である。
第一繊維として、加熱処理が施された繊維B(以下、「加熱処理繊維B」という。)を準備した。すなわち、上述の実施例2で使用された繊維Bに、結晶化温度未満である800℃にて20分の加熱処理を施すことにより、加熱処理繊維Bを得た。第二繊維としては、上述の実施例1でも使用した繊維Cを準備した。
上述の実施例1と同様に、無機繊維質ペーパーのシール性及び圧縮加熱後の復元率を評価した。図4には、生体溶解性無機繊維の配合が異なる6種類の無機繊維質ペーパーについてシール性(L/分)及び圧縮加熱後の復元率(%)を評価した結果を示す。なお、図4に示すシール性及び圧縮加熱後の復元率は、いずれも3つの試験片について得られた値の算術平均値である。
Claims (14)
- 平均繊維径が3μm〜7μmである第一の生体溶解性無機繊維と、
平均繊維径が2μm〜3μmであって、前記第一の生体溶解性無機繊維の平均繊維径より小さい第二の生体溶解性無機繊維と、
バインダーと、
を含み、
前記第一の生体溶解性無機繊維と前記第二の生体溶解性無機繊維は化学組成が異なり、
前記第一の生体溶解性無機繊維が、
SiO2含有量が50〜82質量%であり、CaO含有量が5〜34質量%であり、MgO含有量が1質量%以下であるSiO2/CaO繊維であるか、
SiO2含有量が50〜82質量%であり、MgO含有量が1〜20質量%であり、CaO含有量が1〜9質量%であるSiO2/MgO繊維である無機繊維質ペーパーからなるシール材又は脱硝用触媒緩衝材。 - 前記SiO2/MgO繊維は、BaOを含まない請求項1に記載されたシール材又は脱硝用触媒緩衝材。
- 前記SiO2/CaO繊維及び前記SiO2/MgO繊維は、Al2O3含有量が0〜3質量%である請求項1又は2に記載されたシール材又は脱硝用触媒緩衝材。
- 前記第二の生体溶解性無機繊維が、SiO2を30質量%〜50質量%含有する請求項1乃至3のいずれかに記載されたシール材又は脱硝用触媒緩衝材。
- 厚さが0.1〜8mmである請求項1乃至4のいずれかに記載されたシール材又は脱硝用触媒緩衝材。
- 前記第一の生体溶解性無機繊維の平均繊維径が3.1μm〜4.0μmである
請求項1乃至5のいずれかに記載されたシール材又は脱硝用触媒緩衝材。 - 前記第一の生体溶解性無機繊維を30質量%〜90質量%、及び前記第二の生体溶解性無機繊維を10質量%〜70質量%含む
請求項1乃至6のいずれかに記載されたシール材又は脱硝用触媒緩衝材。 - 前記第一の生体溶解性無機繊維を40質量%〜80質量%、及び前記第二の生体溶解性無機繊維を20質量%〜60質量%含む
請求項7に記載されたシール材又は脱硝用触媒緩衝材。 - 前記第二の繊維が、ロックウールである
請求項1乃至8のいずれかに記載されたシール材又は脱硝用触媒緩衝材。 - 前記第二の繊維が、SiO2を35質量%〜45質量%、MgOを1質量%〜10質量%、CaOを20質量%〜40質量%、Al2O3を10質量%〜20質量%含む繊維である
請求項1乃至8のいずれかに記載されたシール材又は脱硝用触媒緩衝材。 - 前記第一の生体溶解性無機繊維は、予め加熱処理が施された生体溶解性無機繊維である
請求項1乃至10のいずれかに記載されたシール材又は脱硝用触媒緩衝材。 - 前記加熱処理温度が400℃〜1300℃である
請求項11に記載されたシール材又は脱硝用触媒緩衝材。 - 繊維として、前記第一の生体溶解性無機繊維と第二の生体溶解性無機繊維だけを含む請求項1乃至12のいずれかに記載されたシール材又は脱硝用触媒緩衝材。
- 平均繊維径が3〜7μmである第一の生体溶解性無機繊維と、
平均繊維径が2〜3μmであって、前記第一の生体溶解性無機繊維の平均繊維径より小さく、前記第一の生体溶解性無機繊維と化学組成が異なる第二の生体溶解性無機繊維と、
バインダーと、を含む原料から無機繊維質ペーパーを抄造する工程を含み、
前記第一の生体溶解性無機繊維が、
SiO2含有量が50〜82質量%であり、CaO含有量が5〜34質量%であり、MgO含有量が1質量%以下であるSiO2/CaO繊維であるか、
SiO2含有量が50〜82質量%であり、MgO含有量が1〜20質量%であり、CaO含有量が1〜9質量%であるSiO2/MgO繊維である
無機繊維質ペーパーからなるシール材又は脱硝用触媒緩衝材の製造方法。
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